<script src="./vue.js"></script>
 <div id="app">
     <p>{{msg1}}</p >
     <button v-on:click="showInfo">单击我</button>
 </div>
 <script>
     var vue=new Vue({
        el:'#app',
        data: {
         msg1:'点击后改变内容',
        },
        methods: {
          showInfo(){
          this.msg1="我是v-on";
          }
        }
     });
 </script>
 <script>       </script>
